godot-cpp/cmake/emsdkHack.cmake

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#[=======================================================================[.rst:
emsdkHack
---------
The Emscripten platform doesn't support the use of shared libraries as known by cmake.
* https://github.com/emscripten-core/emscripten/issues/15276
* https://github.com/emscripten-core/emscripten/issues/17804
This workaround only works due to the way the cmake scripts are loaded.
Prior to the use of ``project( ... )`` directive we need to set
``CMAKE_PROJECT_INCLUDE=cmake/emscripten.cmake``.
This file will be loaded after the toolchain overriding the settings that
prevent shared library building.
CMAKE_PROJECT_INCLUDE was Added in version 3.15.
``CMAKE_PROJECT_<projectName>_INCLUDE`` was Added in version 3.17:
More information on cmake's `code injection`_
.. _code injection:https://cmake.org/cmake/help/latest/command/project.html#code-injection
Overwrite Shared Library Properties to allow shared libs to be generated.
]=======================================================================]
if( EMSCRIPTEN )
set_property(GLOBAL PROPERTY TARGET_SUPPORTS_SHARED_LIBS TRUE)
set(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-sSIDE_MODULE=1")
set(CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS "-sSIDE_MODULE=1")
set(CMAKE_SHARED_LIBRARY_SUFFIX) # remove the suffix from the shared lib
set(CMAKE_STRIP FALSE) # used by default in pybind11 on .so modules
# The Emscripten toolchain sets the default value for EMSCRIPTEN_SYSTEM_PROCESSOR to x86
# and CMAKE_SYSTEM_PROCESSOR to this value. I don't want that.
set(CMAKE_SYSTEM_PROCESSOR "wasm32" )
# the above prevents the need for logic like:
#if( ${CMAKE_SYSTEM_NAME} STREQUAL Emscripten )
# set( SYSTEM_ARCH wasm32 )
#endif ()
endif ()